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Nonlinear Piezolectric Generators full presentation
Post: #1

Nonlinear Piezolectric Generators
presenterd by:
Francesco Cottone


Introduction: mobile powering issues

Present Vibration Piezoelectric Power Generators

Non-linear piezo-osclillator models
numerical result (Matlab)
finite elements modelling of linear and non-linear oscillators (Comsol)

Conclusions and forthcoming work

Applications examples of WSN

Environmental Monitoring
Habitat Monitoring
Integrated Biology
Structural Monitoring
Interactive and Control
Medical biosensors
Emergency medial response
Intrusion Detection
Interactive museum exhibits
Military applications


Piezoelectric converters appear to be the most attractive for meso-scale devices with a maximum demonstrated power density of approximately 200 mW/cm^3 vs. 100 mW/cm3 for capacitive MEMS devices.

If external excitation is harmonic and itâ„¢s tuned to resonance frequency of the device we can obtain high mechanical energy transfer but it is possible to reach it even with a bi-stability dynamics

For an external excitation with noise or out of resonance, FEA shows that a non-linear bistable beahviour amplify up to a factor 30 or more the vibrational energy extraction

Most of vibrational energy sources live al relative low frequency (for example near hundred Hz) so itâ„¢s hard to tune the resonance mode of the device to external frequencies
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